/*
 * Copyright (C) 2008 TranceCode Software
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 * 
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
 *
 * $Id$
 */
package org.trancecode.rdf;

import java.util.Iterator;


/**
 * @author Herve Quiroz
 * @version $Revision: 3842 $
 */
public interface Model
{
	/**
	 * List of subjects from the triples in this model. There can be duplicates. May support {@link Iterator#remove()}
	 * although the behavior is unspecified.
	 */
	Iterable<Reference> subjects();


	/**
	 * List of predicates from the triples in this model. There can be duplicates. May support {@link Iterator#remove()}
	 * although the behavior is unspecified.
	 */
	Iterable<UriReference> predicates();


	/**
	 * List of objects from the triples in this model. There can be duplicates. May support {@link Iterator#remove()}
	 * although the behavior is unspecified.
	 */
	Iterable<Value> objects();


	/**
	 * Iterate through the triples in this model. May support {@link Iterator#remove()}.
	 */
	Iterable<Triple> triples();


	/**
	 * Add a {@link Triple} to this model.
	 */
	Triple addTriple(Reference subject, UriReference predicate, Value object);


	/**
	 * Replace an existing {@link Triple} or set of triples.
	 */
	Triple replaceTriple(Reference subject, UriReference predicate, ValueFilter oldObject, Value newObject);
}
